[PATCH] s390/vmem: Use swap() instead of open coding it

[Jiapeng Chong <jiapeng.chong@linux.alibaba.com>]

Swap is a function interface that provides exchange function. To avoid
code duplication, we can use swap function.

./arch/s390/mm/vmem.c:680:10-11: WARNING opportunity for swap().

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3786
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 arch/s390/mm/vmem.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 78d7768f93d7..774a71b94f5c 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -674,11 +674,8 @@ static void __init memblock_region_swap(void *a, void *b, int size)
 {
 	struct memblock_region *r1 = a;
 	struct memblock_region *r2 = b;
-	struct memblock_region swap;
 
-	swap = *r1;
-	*r1 = *r2;
-	*r2 = swap;
+	swap(*r1, *r2);
 }
 
 /*
-- 
2.20.1.7.g153144c